Procedure: ASTM G utilizes a nutrient salts agar that provides all of the trace nutritional elements needed by fungi to support growth. However, to achieve a. Buy ASTM G PRACTICE FOR DETERMINING RESISTANCE OF SYNTHETIC POLYMERIC MATERIALS TO FUNGI from SAI Global. ASTM G Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi. This practice covers determination of the effect of.
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A web subscription provides an easy and secure access to standards, and you g21-009 guaranteed to always have the latest edition. Monitoring Standards monitoring is a free service designed for you who wish to be alerted of changes to or new editions of the standards required in your work. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Please first log in with a verified email before subscribing to alerts. As the voice of the U. Your Alert Profile lists the documents that will be monitored. The fungus results are usually determined and recorded as a growth rating: Already Subscribed to this document. If the sample appears to be absent of growth magnifications upwards of 50x, it should be used to verify that no growth exists.
ASTM G21 – National Technical Systems
The fungus results are usually determined and recorded as a growth rating:. Read more about subscriptions. Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods. If the samples are mishandled or suspected of contamination prior to testing, they should be cleaned, Testing cannot be conducted on specimens until 72 hours have passed. It is generally the other components, such as plasticizers, cellulosics, lubricants, stabilizers, and colorants, that are responsible for fungus attack on plastic materials.
Attack on these materials often leaves ionized conducting paths. It can also show, for long test durations, the effects fungus may have on the test specimen, such as changes in appearance, or in mechanical and electrical properties. Start Webshop Product catalog Product presentation. If handling is necessary gloves, should be worn while handling test specimens.
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You may delete a document from your Alert Profile at any time. Determination of these effects is not covered in this practice. Types of Fungal Attacks Fungus can disrupt systems and cause damage in several ways, including: Add to Alert PDF.
Pronounced physical changes are observed on g2-09 in film form or g12-09 coatings, where the ratio of surface to volume is high, and where nutrient materials such as plasticizers and lubricants continue to diffuse to the surface as they are utilized by the organisms.
NTS engineers are extremely careful handling samples for fungus testing, as the cleanliness of the specimens is important prior to testing — especially testing being conducted on a cleaning or decontamination process. There could be fungal spores on the samples that are not readily visible to the eye due to the size of the spores, localized areas of growth, or because the color of the spores are similar to those of the test specimen.
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You need to log in before adding standards to the monitoring service. Spores are grown for approximately 2 — 3 weeks, followed by inoculation of the spore suspension the combined spores that are selected for testing and placed in a test chamber for 28 days or as specified. The benefits of a subscription: Historical Version s – satm previous versions of standard.
To assess materials other than plastics, use of this test method should be agreed upon by all parties involved.
To ensure that estimates of behavior are not too optimistic, the greatest observed degree of deterioration should be reported. The inch-pound units given in parentheses are for information only.
Changes in optical, mechanical, and electrical properties may be determined by the applicable Atm methods. The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email. We have no amendments or corrections for this standard.
Referenced Documents purchase h21-09 The documents listed below are referenced within the subject standard but are not provided as part of the standard. Many products that operate in warm, humid environments must be tested to withstand fungal attacks, since this problem can cause myriad of operational challenges.
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